Did you go through this one --> http://wiki.modxcms.com/index.php/Beginner%27s_Guide_to_MODx
//The index file in the template folder should be copied into a new template and saved, then you need to edit
the template from inside modx as described.
You will need to edit the file paths for images and files inside the template as described.
//If you can open the index file in its folder and that works in a web browser, then it works.

Your actual structure is different from the original template - your "sidebar" block is outside the "container" block. Move it back inside, and the right column comes into place.